Silverlight 5 has exactly the same issues
with denial of service and lack of
robustness in the graphics drivers as
WebGL. Therefore it is important to work
together with MS to get them fixed. One of
the most important things MS could do is
push PC vendors, particularly laptop
vendors, to provide graphics driver
updates on a regular basis.

In fact any graphics used in the web
browser, HTML5, Canvas 2D, Flash,
Molehill, Silverlight 5 potentially faces
these problems. Witness the driver
"blocklists" maintained by both Firefox
& Chrome for all of their accelerated
graphics features.

I really think the best way to deal with
this is for developers to tell MS how
important WebGL support is and how they
want to see it in IE (if you care). IMO
that is the most reliable method of
getting MS to the table to make positive
contributions to the discussion.